Antique radios, Old Time Radios
42E
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| Identical to |
42E
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| Similar
Tubes |
Normally replaceable-slightly different:
42
Heater different:
18E; 2A5E
Other base:
6F6EG
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| Base |
6-Pin-Base U6A, old, USA (Codex=K)
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| Was used by |
Radio/TV-reception etc. |
| Filament |
Vf 6.3 Volts / If: 0.7 Ampere / -: Indirect / -: Parallel, (AC/DC) / |
| Description |
G3 connected w/ g1 inside the tube.__[JR]
Text in other
languages (may
differ)
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| Literature |
Taschenbuch zum Röhren-Codex 1948/49
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PHILCO 42E USA
John Albion
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ARRL Handbook 1972
Michael Schlör
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| Further Information for |
42E |
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42E (42E)
(22.03.2008) Jacob Roschy
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Clicks: 157 Replies: 0 |
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Apparently the tubes 2A5 E , 18 E , 42 E and most probably the 6F6 E G are special versions of 2A5, 18, 42 and 6F6G.
They distinguish against their normal versions in that way, as their grid # 3 (suppressor grid) is connected to grid # 1 (control grid), instead of being connected with cathode, as usually.
In Europe the tube company Tungsram followed this fashion by releasing some tube types of the same peculiarity and called them "Tetraforte". Known type were at least the PP415 as direct heated type and the APP4120 as indirect heated tube.
Apparently, both the PP415 and the APP4120 were also available as normal penthodes, with g3 connected to cathode.
It would be interesting to find articles and other information about these tubes in contemporary literature of the early 1930s. By now, we know very little, with exception of some schematics and base diagrams, where the g3 to g1 connection is visible.
Best Regards , Jacob
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42E Gitter 1 & 3 parallel !
(21.03.2008) Jacob Roschy
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Clicks: 171 Replies: 0 |
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Gitter 1 & 3 parallel !
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